*
     * @param date the date to format
     * @return formatted date string, or empty string if date is null
     */
    public static String formatDate(final Date date) {
        if (date == null) {
            return StringUtil.EMPTY;
        }
        final SimpleDateFormat sdf = new SimpleDateFormat(Constants.ISO_DATETIME_FORMAT);

        @Override
        public String getVirtualHostKey() {
            return ""; // Return empty string for testing
        }
    }

    private static class MockRoleQueryHelper extends RoleQueryHelper {
        @Override
        public Set<String> build(SearchRequestType searchRequestType) {
            // Return empty set for no roles
            return new HashSet<>();
        }
    }

    }

    @Test
    @DisplayName("Test with empty strings")
    void testWithEmptyStrings() {
        SmbShareInfo info = new SmbShareInfo("", 0, "");

        assertEquals("", info.getName());
        assertEquals(SmbConstants.TYPE_SHARE, info.getType());

        // Test equals with empty string
        SmbShareInfo info2 = new SmbShareInfo("", 1, "Different");

    }

    @Test
    @DisplayName("Test getResults with empty array")
    void testGetResultsWithEmptyArray() throws Exception {
        response = new Smb2QueryDirectoryResponse(mockConfig, (byte) 0x03);

        // Use reflection to set the results field to empty array
        Field resultsField = Smb2QueryDirectoryResponse.class.getDeclaredField("results");

        if (synonymLoader.getSynonymMap() == null) {
            if (settings.getAsList("synonyms", null) != null) {
                logger.warn("synonyms values are empty.");
            } else if (settings.get("synonyms_path") != null) {
                logger.warn("synonyms_path[{}] is empty.", settings.get("synonyms_path"));
            } else {
                logger.debug("No synonym data.");
            }
        }
    }

    @Override

			expectedErr: errInvalidRuleID,
		},
		{ // Rule with empty ID
			inputXML: `<Rule>
							<ID></ID>
							<Filter><Prefix></Prefix></Filter>
							<Expiration>
								<Days>365</Days>
							</Expiration>
                            <Status>Enabled</Status>
	                    </Rule>`,
			expectedErr: nil,
		},
		{ // Rule with empty status
			inputXML: ` <Rule>

	targets := make([]Target, 0, len(list.targets))
	for _, tgt := range list.targets {
		targets = append(targets, tgt)
	}

	return targets
}

// Empty returns true if targetList is empty.
func (list *TargetList) Empty() bool {
	list.RLock()
	defer list.RUnlock()

	return len(list.targets) == 0
}

// List - returns available target IDs.

 */
@GwtCompatible
@Immutable
public final class ImmutableDoubleArray implements Serializable {
  private static final ImmutableDoubleArray EMPTY = new ImmutableDoubleArray(new double[0]);

  /** Returns the empty array. */
  public static ImmutableDoubleArray of() {
    return EMPTY;
  }

  /** Returns an immutable array containing a single value. */
  public static ImmutableDoubleArray of(double e0) {

 * @since 22.0
 */
@GwtCompatible
@Immutable
public final class ImmutableIntArray implements Serializable {
  private static final ImmutableIntArray EMPTY = new ImmutableIntArray(new int[0]);

  /** Returns the empty array. */
  public static ImmutableIntArray of() {
    return EMPTY;
  }

  /** Returns an immutable array containing a single value. */
  public static ImmutableIntArray of(int e0) {

  }

  /**
   * Returns the string if it is not null, or an empty string otherwise.
   *
   * @param string the string to test and possibly return
   * @return {@code string} if it is not null; {@code ""} otherwise
   */
  static String nullToEmpty(@Nullable String string) {
    return (string == null) ? "" : string;
  }

  /**
   * Returns the string if it is not empty, or a null string otherwise.
   *